"Boys, I believe I have found a gold mine!" shouted James Marshall to his fellow workers while digging in California's American River. The discovery of this valued substance changed the way settlers looked at California. Before the Gold Rush, California was a new region gained from Spain and Mexico. The region had little industry and agriculture Now it is full of opportunity and riches! "Argonauts of '49" and "Forty-niners," is the nickname given to those who traveled to California, desiring to become rich off of the gold. The mass immigration to California, also known as the Gold Rush, caused treasure hunters from Europe, Australia, Latin America and Asia to arrive in America. . The Gold Rush helped to industrialize the region. The California Gold Rush was beneficial in the eyes of people ;however, to others it is just the sin of greed coming forward in the American people.